Mandrel separable fastener inserting tools



Allg 8 1967 R. M. ELLIOTT r-:TAL 3,334,509

MANDREL SEPARABLE FASTENER INSERTING TOOLS Filed June l5, 1965 United States Patent O 3 334 509 MANDREL SEPARABLE iAsTENER INSERTING TOOLS Richard M. Elliott, Beverly, and Raymond M. Tremblay, Whitman, Mass., assguors to United Shoe Machinery Corporation, Flemington, NJ., a corporation of New Jersey Filed .lune 15, 1965, Ser. No. 464,154 9 Claims. (Cl. 72-391) This invention relates to fastener inserting tools and more especially to improvements in rivet setting tools of the type disclosed in United States Letters Patent No. 3,154,210, granted Oct. 27, 1964, on `an application filed in our names. In such tools a tubular blind rivet is set by tension exerted on a separable mandrel extending axially therein and relatively moved endwise. While the invention is herein illustrated as applied to hand tools and rivets of the construction indicated, it will be understood that application of this invention is not thus limited.

When the patented tool referred to is operated by relatively moving its handles, considerable mechanical advantage is employed to exert the required high mandrel pulling force for setting the ends of the rivet against the opposite sides of a work piece. The diameter of each mandrel usually determines the initial spacing between a pair of jaws of the tool which are adapted to receive, grip, and pull the mandrel away from an apertured nose portion of the tool. While it is desirable that the tool shall be able to accommodate at least a small range of mandrel diameters, in order to avoid having to repeat, or excessively repeat, gripping of a mandrel by manual operation of the handles, it is desirable to have a very large portion of the handle motion effecting mandrel tensioning rather than mere mandrel gripping. Also, if the mandrel receiving hole in the nose portion, which is generally axially aligned with the cooperating jaws, is of larger diameter than the mandrel of the rivet to be set, tight installation may not be attained. This is because a rivet flange further formed in the course of setting may be deformed by being pulled partly into the nose aperture and/ or the barrel be tilted with respect to its axis.

In view of the foregoing, it is an object of this invention to provide a blind rivet setting tool of inexpensive construction and readily adjustable to install effectively more than one size of rivet. More particularly, it is a primary object of this invention to provide, in a riveting tool having cooperative jaws for axially tensioning a large di-ametered mandrel to pull its rivet barrel against the wall of a mandrel receiving aperture, an auxiliary anvil member having therein -a smaller aperture and movably mounted on the tool for superimposing the smaller aperture on the larger one to accommodate smaller mandrel diameters.

To these ends, and in accordance with a -feature of the invention, in one illustrated embodiment a U-shaped shiftable anvil has a snap-on, detachable mounting and is pivotally related to the tool, the arrangement being such that the mandrel receiving aperture of the anvil is swingable into operating position to reduce the effective diameter of the mandrel receiving aperture provided in the tool for receiving larger diameters of mandrels.

In an alternative construction shown herein, a slidable auxiliary anvil piece is featured, the piece being formed at one end with a reduced aperture and having pin and slot connection with the base of the tool whereby the operative positioning of the anvil piece thereon may be readily determined.

The features of the invention will now be described in more detail and with reference to the accompanying drawings thereof, in which:

3,334,509 Patented Aug. 8, 1967 FIG. l is a view in side elevation, partly in section, of the front portion of the riveting tool disclosed in the above cited patent and provided with an auxiliary anvil according to the present invention;

FIG. 2 is a view corresponding to FIG. 1, but showing the auxiliary anvil moved into operating position to accommodate a smaller diameter of a mandrel than the one gripped by the jaws in FIG. l;

FIG. 3 is a perspective view on a larger scale of the slidable anvil shown in FIGS. 1 and 2;

FIG. 4 is a perspective view of an alternate form of the auxiliary anvil in its operative and inoperative positions; and

FIG. 5 is an enlarged detail view of the gripping jaws, and showing a means by which the space initially separating their mandrel gripping portions may be adjusted.

Only so much of the illustrative patented tool referred to will be described as is essential to understand the present invention. It comprises a lirst operating handle 1) of sheet metal bent to provide a housing including a base 12 and a pair of spaced side walls 14 (one broken away) extending upwardly from the base. The side walls 14 enclose mandrel gripping and tensioning means herein shown in the -forrn of a drawbar 16 provided with a U-shaped jaw 17 and a cooperating jaw 18 pivoted to the drawbar 16 at 20. A second operating handle 22 (FIG. l) pivoted to the side walls 14 by a pivot pin 24 carries forwardly thereof a pivot pin 26 for pendulously supporting the drawbar 16.

FIG. 1 shows a blind fastener inserted in the tool for setting and includes a headed mandrel 30- of relatively large diameter which was preassembled with its tubular rivet 32. The head of the mandrel and the non-flanged end of the rivet has been thrust through an opening in the work pieces W to be secured, and the mandrel 30 extends through a xed anvil aperture 34 of only slightly larger diameter which is centrally formed in an embossment 36 in the base 12. It will accordingly be understood that a spring 38 biases the jaws into an initial mandrel retaining position shown in FIG. l which is substantially in alignment with the axis of the aperture 34. Thereafter, relative movement of the handles 10, 22 is effective to tension the mandrel and force a prellanged end of the barrel of the rivet 32 against the embossment 36, whereupon the non-flanged end of the rivet is upset and an expendable portion of the mandrel stern is broken off and released from the tool.

A fastener comprising a mandrel 40 (FIG. 2) of smaller diameter is also set in the general manner just described. However, the diameter of the aperture 34 being larger than that of the mandrel 40, there is the probability that the unset -but preflanged rivet end or some portion thereof may extend into the aperture 34 and become deformed to provide a slipshod and insecure fitting. To insure that this does not occur, and to avoid the need for a second tool, an auxiliary anvil 4Z (FIGS. 1-3) is provided. It has at one end a reduced mandrel receiving aperture 44 only slightly larger than the mandrel 40, the aperture 44 being central in a conical embossment 46 adapted to be shifted into register with the embossment 36. Preferably, the side margins of the anvil 42 are turned up to serve as guides for its to and fro movement, the anvil having a slot 48 for receiving the shank of a retaining pin 50 anchored in the base 12. A rolled rearward end 52 of the slidable anvil 42 may be grasped to shift the aperture 44 into operating position, forward movement being `appropriately limited by engagement of the pin 50 and an end of the slot 48, as shown in FIG. 2.

FIG. 2 illustrates the auxiliary anvil 42 in position to receive the smaller mandrel diameter and align the mandrel axis with the gripping jaws as well as with the apertures 34, 44. In the course of upward pendulous movement of the drawbar 16 within the tool to tension the mandrel 40, its head acts endwise on the rivet barrel to effect upsetting of its unflanged end on the blind side of the work, and its prefianged end against the embossment 46. Thus the clinched rivet has its flanges symmetrically shaped on opposite sides of the work uniformly to clamp it.

In an alternate dual anvil construction shown in FIG. 4, a U-shaped auxiliary anvil 60, sometimes referred to as a nosepiece, is pivotally connected to the handle 10. For this purpose spaced legs 62, 62 of the anvil 60 are respectively formed with ali-gned protrusions 64 which extend into holes 66, 66 respectively formed in the side walls 14. The legs are preferably resiliently biased toward one another thus to enable the anvil to be snapped on and pivotally supported by the tool for movement between its inoperative position indicated by dash lines, and an operative position indicated by full lines. The bridge portion of the anvil is centrally formed with a conical embossment 68 adapted to overlie the embossment 36 in the base 12 of the tool. As in the construction above explained a mandrel-receiving aperture 70 in the embossment 68 is of smaller diameter than that of the nonshiftable embossment 36 properly to accommodate the mandrels and rivets having smaller diameters.

The holes 66, 66 may be somewhat elongated heightwise of the tool to enable the bridge position of the anvil 60 to clear the base 12 when pivoted on its protrusions 64, and to enable the embossment 36 to -be received in the embossment 68. An advantage of this modified auxiliary anvil is that it may be quickly detached and attached when the work to be performed will be limited primarily to setting fasteners of one diameter.

In using the illustrated and other dual anvil arrangements, it is possible (due to the range of mandrel diameters being pulled, to the wear of the arcuately disposed jaw gripping teeth, or other factors) that it may become desirable to adjust the initial mandrel receiving space between the jaws. For this purpose, as shown in FIG. 5, an eccentric pin 72 extending through the jaw 18 is supported at one end on a hub 74 seated in one side of the drawbar, and at the opposite end on a liatted head 76 seated in a correspondingly shaped bore in the opposite side of the drawbar. As shown, biased teeth 73 of the jaw 18 are appropriately spaced initially from the adjacent cooperating portion of the drawbar for receiving and retaining rnandrels of substantially one smaller diameter. By axially unseating the head 76 and turning the eccentric pin 72 180 about its axis before reinserting the head 76 in its newly locked position in the drawbar, the teeth 78 will be shifted to the right better to accommodate mandrels of a larger diameter.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent of the United States is:

1. In a tool for setting tubular rivets in a work piece by tensioning coaxial mandrels therein, and comprising a housing formed with a fixed anvil aperture for receiving endwise the stem of a mandrel of a rivet to be set, the improvement which consists in providing an auxiliary anvil formed with a smaller mandrel receiving-aperture, and means mounting the auxiliary anvil for movement into and out of an operating position in which its smaller aperture overlies the fixed anvil aperture.

2. vFor mounting on the base of `a tool for setting separable mandrel rivets, the tool having cooperative jaws for gripping and tensioning the stem of a mandrel inserted through a fixed anvil aperture in the base, an auxiliary anvil movably mounted on the base, the auxiliary vanvil being formed with a smaller mandrel-receiving aperture adapted to be shifted into register with the fixed aperture to reduce the diameter of mandrel receivable therein and upset its rivet during operation of said jaws.

3. An auxiliary anvil as set forth in claim 2, said anvil being formed on one end with an apertured embossment for receiving the mandrel, and having a pin and slot connection for slidably securing the auxiliary anvil to the tool base, said connection being adapted to limit movement of the anvil in one direction to register the apertured embossment with said fixed anvil.

4. An auxiliary anvil as set forth in claim 3 and further characterized in that its opposed margins are angularly disposed with respect to the base to guide the auxiliary anvil thereon, and an end of the auxiliary anvil is formed with a handle to facilitate its movement into and out of operative position.

5. In a tool for settin-g mandrel separable rivets and having an apertured anvil nose position for receiving a mandrel to be tensioned to set a rivet thereon, an auxiliary anvil pivoted to the tool adjacent to its nose portion and formed with an embossment centrally apertured with a diameter less than the aperture of said anvil nose, whereby the latter and the auxiliary anvil may coaxially receive the mandrel to upset its rivet endwise when the mandrel is tensioned.

6. An auxiliary anvil as set forth in claim 5 wherein it includes a U-shaped piece the bridge of which is formed with said apertured embossment, and the sides of which are adapted for pivotal snap-on connection to the tool.

7. In a tool having a pair of cooperative jaws for gripping and tensioning the mandrel of a mandrel separable rivet, a pin pivotally interconnecting the jaws at a point removed from their mandrel-gripping portions, said pin being eccentrically mounted in one of said jaws to enable its mandrel-gripping portion to be adjustably spaced from the other mandrel-gripping portion.

8. In a tool having a pair of cooperative jaws for -gripping and tensioning the mandrel of a mandrel separable rivet, one of the jaws being nested between opposite sides of the other jaw, a pivot pin having a cylindrical central portion extending through the nested jaw and aligned eccentric end portions respectively extending in said opposite side portions of said other jaw, one of the eccentric end portions of the pivot pin being a diametrically tiatted circle in section and carried in a correspondingly shaped bore in its side portion of said other jaw.

9. A tool as set forth in claim 8 further characterized in that, for one setting of the pivot pin, the jaws are adapted initially to receive a mandrel stem inserted through a fixed anvil aperture, and, upon turning the pin in said bore, the jaws are adapted initially to receive the smaller diameter of a mandrel, an auxiliary `anvil being shiftable to register its smaller aperture on that of the fixed anvil.

References Cited UNITED STATES PATENTS 2,073,960 3/1937 Crosby 72--469 3,003,657 10/1961 Siebot 72--391 3,154,210 10/1964 :Elliott 72-391 CHARLES W. LANHAM, Primary Examiner. G. P, CROSBY, Assistant Examiner, 

1. IN A TOOL FOR SETTING TUBULAR RIVETS IN WORK PIECE BY TENSIONING COAXIAL MANDRELS THEREIN, AND COMPRISING A HOUSING FORMED WITH A FIXED ANVIL APERTURE FOR RECEIVING ENDWISE THE STEM OF A MANDREL OF A RIVET TO BE SET, THE IMPROVEMENT WHICH CONSISTS IN PROVIDING AN AUXILIARY ANVIL FORMED WITH SMALLER MANDREL RECEIVING-APERTURE, AND MEANS MOUNTING THE AUXILIARY ANVIL FOR MOVEMENT INTO AND OUT OF AN OPERATING POSITION IN WHICH ITS SMALLER APERTURE OVERLIES THE FIXED ANVIL APERTURE. 